<template>
    <div class="cmt-container">
        <h3>发表评论</h3>
        <hr>
        <textarea placeholder="请输入要评论内容(最多120个字)" maxlength="120" v-model="msg"></textarea>

        <mt-button type="primary" size="large" @click="postConmment">发表评论</mt-button>

        <div class="cmt-list">
            <div class="cmt-item" v-for="(item,i) in comments" :key="item.add_time">
            <div class="cmt-title">
            第{{i+1}}楼&nbsp;&nbsp;用户:{{item.user_name}}&nbsp;&nbsp;发表时间:{{item.add_time | dateFormat}}
                </div>
                <div class="cmt-body">
                {{item.content === 'undefined' ? '该用户很懒' :item.content}}
                </div>
            </div>
        </div>


        <mt-button type="danger" size="large" plain @click="getMore">加载更多</mt-button>
    </div>
</template>

<script>
import { Toast } from "mint-ui";
export default {
  data() {
    return {
      pageIndex: 1, //默认显示第一页
      comments: [], //保存评论数据
      msg: "" //发表评论
    };
  },
  created() {
    //调用方法
    this.getComments();
  },
  methods: {
    //获取评论
    getComments() {
      this.$http
        .get(
          "api?type=getcomments&artid=" +
            this.id +
            "&pageindex=" +
            this.pageIndex
        )
        .then(result => {
          if (result.body.status === 0) {
            // this.comments = result.body.message;
            this.comments = this.comments.concat(result.body.message); //加载更多的时候 不要清空上一次的
          } else {
            Toast("获取评论失败");
          }
        });
    },
    getMore() {
      //加载更多
      this.pageIndex++;
      this.getComments();
    },
    postConmment() {
      //发表评论
      // 校验是否为空
      if (this.msg.trim().length === 0) {
        return Toast("评论不能为空");
      }

      this.$http
        .post('api?type=postcomment&artid='+this.id+'&content='+this.msg, {
          content: this.msg.trim()
        })
        .then(function(result) {
          if (result.body.status === 0) {
            var cmt = {
              user_name: "匿名用户",
                add_time:Date.now(),
              content: this.msg.trim()
            };
            this.comments.unshift(cmt);
            this.msg = ""
          } else {
          }
        });
    }
  },
  props: ["id"]
};
</script>

<style lang="scss" scoped>
.cmt-container {
  h3 {
    font-size: 18px;
  }
  textarea {
    font-size: 14px;
    height: 85px;
    margin: 0;
  }
  .cmt-list {
    margin: 5px 0;
    .cmt-item {
      font-size: 13px;
    }
    .cmt-title {
      line-height: 35px;
      background-color: #ccc;
    }
    .cmt-body {
      line-height: 35px;
      text-indent: 2em;
    }
  }
}
</style>

